Thread: Injectors Vs. boost level
09-05-2011, 10:11 AM #1
Injectors Vs. boost level
Hi guys, just wondering something....thought i might just ask up here since many of you have already run several differnet mod level, so here i ask:
Suppose i use an Et-137 charger that can produce about 12.5lbs of pressure at 8100RPM, slightly above the x charger level of boost. And plan on using ONLY 42-48-50 pounds fuel injectors, no external intercooler, no additionnal rrfpr, do you think it could be safely managed by the ECU, and work fine like this...?
I mean....the X from factory have about 10.5PSI boost pressure, strickly on 42pounds stock, no rrfpr, but IMO that it has an external intercooler which i won't have here.
My biggest concerns are:
A-Would the fuel pump stock pressure allow enough fuel to feed the bigger injectors?
B-What size of injectors should i run, if i use no rrfpr...?
C-Would the added boost pressure temp would be handled by the stock 215 intercooler?
D-I do not plan to race, only rec riding with few pass of high speed from time to time
E-I do not plan to up the rev higher than stock ECU 8100RPM.
Let's see what you think...?
Does anybody of you have already monitor A/F ratio of similar set-up...? Do you have infos to share on this...?
09-05-2011, 04:10 PM #2
- Join Date
- Dec 2006
- Crest Hill, IL
What air intake system you running? If stock, you can run a set of 42's and will be safe on the OEM IC...
09-05-2011, 04:51 PM #3
09-05-2011, 05:04 PM #4
i have a 4" intake, x charger and 42lb injectors your temps are probably pretty close to mine here and wot i am at 11.2-11.3 so i would think with the 137 it should lean you out a little more but not to much
09-05-2011, 10:02 PM #5
42s will probably be lean with that setup... you may and probably will need 48s remember an x ski runs 42s with a 10.5 boost wheel in the charger... et 137 is a 13.5 boost wheel.... only true way is to run AFRs and truly get a reading so you know how to properly tune. what ski are you running now? rxp or x boat? weather will change the AFRs as well... cooler temps requre more fuel in most cases so on a cool day without knowing your proper AFRs it may be placing you in the danger zone of running real lean.... Best way to be safe is to run a AFR setup with RRFPR . Quick easy and simple to set up. General range is 11.2 idle 13-13.5 mid range cruzin and WOT 11.8 is a good base....
just my 2 cents.. but truly you need a AFR setup to know exacally what your engines doing..
09-07-2011, 08:46 PM #6
Thanks guys....! God it's great talking with peoples that knows their stuff....i'm definitely addicted to this forum here...!
09-08-2011, 08:42 AM #7
- Join Date
- Jan 2007
- Lakeland, FL
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